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pcd.go
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pcd.go
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package pcd
import (
"bytes"
"encoding/base64"
"encoding/gob"
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"github.com/kvannotten/pcd/rss"
"github.com/pkg/errors"
)
type Podcast struct {
ID int
Name string
Feed string
Path string
// Login data if there's authentication involved
Username string
Password string
// List of episodes
Episodes []Episode
}
type Episode struct {
Title string
Date time.Time
URL string
Length int
}
var (
ErrCouldNotSync = errors.New("Could not sync podcast")
ErrRequestFailed = errors.New("Could not perform request")
ErrAccessDenied = errors.New("Access denied to feed")
ErrFilesystemError = errors.New("Could not do filesystem request")
ErrParserIssue = errors.New("Could not parse feed")
ErrEncodeError = errors.New("Could not encode feed")
ErrFeedNotFound = errors.New("Could not find feed (404)")
ErrCouldNotDownload = errors.New("Could not download episode")
ErrCouldNotReadFromCache = errors.New("Could not read episodes from cache. Perform a sync and try again.")
ErrCouldNotParseContent = errors.New("Could not parse the content from the feed")
)
func (p *Podcast) Sync() error {
client := &http.Client{}
req, err := http.NewRequest("GET", p.Feed, nil)
if err != nil {
log.Print(err)
return ErrCouldNotSync
}
if p.Username != "" {
req.SetBasicAuth(p.Username, p.Password)
}
resp, err := client.Do(req)
if err != nil {
log.Print(err)
return ErrRequestFailed
}
switch resp.StatusCode {
case http.StatusOK: // NOOP
case http.StatusForbidden, http.StatusUnauthorized:
return ErrAccessDenied
case http.StatusNotFound:
return ErrFeedNotFound
case http.StatusInternalServerError:
return ErrRequestFailed
default:
return ErrRequestFailed
}
defer resp.Body.Close()
p.Episodes, err = parseEpisodes(resp.Body)
if err != nil {
log.Print(err)
return ErrParserIssue
}
if err := os.MkdirAll(p.Path, os.ModePerm); err != nil {
log.Print(err)
return ErrFilesystemError
}
path := filepath.Join(p.Path, ".feed")
f, err := os.Create(path)
if err != nil {
log.Print(err)
return ErrFilesystemError
}
defer f.Close()
blob, err := toGOB64(p.Episodes)
if err != nil {
log.Print(err)
return ErrEncodeError
}
if _, err := io.Copy(f, blob); err != nil {
log.Print(err)
return ErrFilesystemError
}
return nil
}
func (p *Podcast) Load() error {
path := filepath.Join(p.Path, ".feed")
f, err := os.Open(path)
if err != nil {
log.Printf("Could not open feed file: %#v", err)
return ErrCouldNotReadFromCache
}
defer f.Close()
p.Episodes, err = fromGOB64(f)
if err != nil {
log.Printf("Could not decode episodes: %#v", err)
return ErrCouldNotReadFromCache
}
return nil
}
const (
titleLength = 60
)
func (p *Podcast) String() string {
var sb strings.Builder
sb.WriteString(fmt.Sprintf("All episodes of %s (id: %d)\n", p.Name, p.ID))
// find longest episode title to see if title length is smaller than titleLength
tl := 0
for _, episode := range p.Episodes {
if len(episode.Title) > tl {
tl = len(episode.Title)
}
}
if tl > titleLength {
tl = titleLength
}
for index, episode := range p.Episodes {
title := episode.Title
if len(episode.Title) > titleLength {
title = fmt.Sprintf("%s...", episode.Title[0:(titleLength-4)])
}
formatStr := fmt.Sprintf("%%-4d %%-%ds %%20s\n", tl)
sb.WriteString(fmt.Sprintf(formatStr, index+1, title, episode.Date.Format(rss.Layout)))
}
return sb.String()
}
// Download downloads an episode in 'path'. The writer argument is optional
// and will just mirror everything written into it (useful for tracking the speed)
func (e *Episode) Download(path string, writer io.Writer) error {
res, err := http.Get(e.URL)
if err != nil {
log.Printf("Could not download episode: %#v", err)
return ErrCouldNotDownload
}
defer res.Body.Close()
if res.StatusCode != 200 {
log.Printf("Could not download episode: %#v", err)
return ErrCouldNotDownload
}
tokens := strings.Split(e.URL, "/")
filename := tokens[len(tokens)-1]
fpath := filepath.Join(path, filename)
f, err := os.Create(fpath)
if err != nil {
log.Printf("Could not create file: %#v", err)
return ErrCouldNotDownload
}
defer f.Close()
var mw io.Writer
if writer != nil {
mw = io.MultiWriter(f, writer)
} else {
mw = f
}
if _, err := io.Copy(mw, res.Body); err != nil {
log.Printf("Could not write to file: %#v", err)
return ErrCouldNotDownload
}
return nil
}
func parseEpisodes(content io.Reader) ([]Episode, error) {
feed, err := rss.Parse(content)
if err != nil {
return nil, ErrCouldNotParseContent
}
var episodes []Episode
for _, item := range feed.Channel.Items {
t, err := time.Parse(rss.Layout, item.Date.Date)
if err != nil {
log.Printf("Could not parse episode: %#v", err)
continue
}
episode := Episode{
Title: item.Title.Title,
Date: t,
URL: item.Enclosure.URL,
Length: item.Enclosure.Length,
}
episodes = append(episodes, episode)
}
return episodes, nil
}
func toGOB64(episodes []Episode) (io.Reader, error) {
b := bytes.Buffer{}
e := gob.NewEncoder(&b)
if err := e.Encode(episodes); err != nil {
return nil, err
}
dst := bytes.Buffer{}
encoder := base64.NewEncoder(base64.StdEncoding, &dst)
encoder.Write(b.Bytes())
defer encoder.Close()
return &dst, nil
}
func fromGOB64(content io.Reader) ([]Episode, error) {
var episodes []Episode
decoder := base64.NewDecoder(base64.StdEncoding, content)
d := gob.NewDecoder(decoder)
if err := d.Decode(&episodes); err != nil {
return nil, err
}
return episodes, nil
}